本文研究油壓式張力器對引擎正時鏈系統的影響，以及探討引擎長時間運轉後之鬆弛現象對預壓力以及止推力的影響，並且分析張力器作動原理，並於油不可壓縮的假設下利用納維-斯托克斯方程式建立張力器受力模型，最後於模擬軟體對實驗進行分析與驗證。
然後，將張力器獨立於正時鏈系統做靜態實驗與動態實驗，在空氣量不同的情況下利用位移平台以低速度推動柱塞，比較空氣含量多寡對止推力的影響；動態實驗則利用馬達驅動偏心凸輪，以模擬導桿振動幅度與振動頻率對張力器受力的關係；將引擎正時鏈系統架設於實驗平台上，並以直流馬達驅動曲軸進行實驗量測，比較不同轉速之驅動扭矩、低壓室壓力、張力器受力及柱塞位置，並藉由更改裝配方式比較外彈簧與止推力對正時鏈系統的影響；利用多體動力學之商用軟體建立引擎正時鏈系統模型，並將止推力以函數的方式作用於張力器與導桿的接觸面，模擬不同轉速下之張力器受力並與正時鏈系統實驗結果進行比較；最後藉由鏈條拉伸實驗量測鏈條間隙大小，以及導桿變形量測實驗以求得等效導桿變形之扭轉彈簧勁度，並將參數輸入引擎正時鏈系統模型中，比較鏈條鬆弛前後之張力器受力以及引擎無運轉下之預壓力，並且提出維持預壓力以及止推力之設計方法。

The purpose of this thesis is to analyze the dynamic behavior of timing chain system and build mathematical model of hydraulic tensioner, which is able to be applied in CAE software. The mathematical model of tensioner force is developed with Navier-Stokes equation under the premise that the oil is incompressible. A static experiment test setup to analyze the effect of air in tensioner force. With different air proportion in tensioner, the motion platform pushes plunger at the velocity 0.1 mm/s to eliminate dynamic effect, and loadcell measures plunger force in every case. In order to simulate dynamic effect of chain vibration to tensioner force, the eccentric cam is driven by motor in different rotation speed to convert the rotational movement of a motor driven cam disc in a translation movement. The engine timing system experiment is assembled on experimental platform and the crankshaft is driven by motor. Sensors which are mounted at engine used to measure driving torque, LPC pressure, tensioner force and plunger position in different engine speed. Timing chain system engine is modeled by commercial software based on multi-body dynamics. The no-return force in the form of function applied on the contact surface between plunger and guide in software, and the simulation results are compared with measurement result. In order to discuss the effect of chain clearance and tensioner preload when engine is static, the tensile test and guide experiment are developed to acquire essential parameter. Finally, with simulation result, the method of maintaining tensioner preload and no-return force after chain loose is presented.

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